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This page lists all entries on GRB170817B in GRBweb

Summary Fermi GBM GCN 21540 GCN 21593

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB170817908
T0	21:47:34.430 UTC	GCN_circulars,Fermi GBM Det
ra	83.0300°	Fermi_GBM
decl	50.0700°	Fermi_GBM
pos_error	3.28e+00°	Fermi_GBM
T90	2.624 s	Fermi_GBM
T90_error	0.181 s	Fermi_GBM
T90_start	21:47:34.434 UTC	Fermi_GBM
fluence	2.15e-06 erg/cm²	Fermi_GBM
fluence_error	1.91e-08 erg/cm²	Fermi_GBM
T100	2.628 s
GBM_located	True
mjd	57982.90803738426	GCN_circulars,Fermi GBM Det

Fermi GBM table
GRB_name_Fermi	GRB170817908
trigger_name	bn170817908
ra	83.0300°
decl	50.0700°
pos_error	3.28e+00°
datum	2017-08-17
t_trigger	21:47:34.434 UTC
T90	2.624 s
T90_error	0.181 s
T90_start	21:47:34.434 UTC
fluence	2.15e-06 erg/cm²
fluence_error	1.91e-08 erg/cm²
flux_1024	7.10e+00 erg/cm²/s
flux_1024_error	2.98e-01 erg/cm²/s
flux_1024_time	1.92e-01 erg/cm²/s
flux_64	1.04e+01 erg/cm²/s
flux_64_error	1.61e+00 erg/cm²/s

GCN 21540 table
GRB_name	GRB170817B
GCN_number	21540
Detection_method	Fermi GBM Det
t_trigger	21:47:34.430 UTC
ra	83.0000°
decl	50.1000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 21540 SUBJECT: GRB 170817B: Fermi GBM detection DATE: 17/08/18 04:12:29 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 21:47:34.43 UT on 17 August 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170817B (trigger 524699259 / 170817908). The on-ground calculated location, using the GBM trigger data, is RA = 83.0, DEC = +50.1, with an uncertainty of 3.7 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ). The initial angle from the Fermi LAT boresight to the GBM best location is 90 degrees. The GBM triggered multiple short unresolvable pulses over a total duration (T90) of 2.6 s (50-300 keV). The time-averaged spectrum from T0+0.0 to T0+2.6 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.87 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 1120 +/- 228 keV The event fluence (10-1000 keV) in this time interval is (4.93 +/- 0.16)E-06 erg/cm^2. The 64 ms peak photon flux measured starting from T0+0.0 s in the 10-1000 keV band is 10.4 +/- 1.6 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

GCN 21593 table
GRB_name	GRB170817B
GCN_number	21593
Detection_method	Insight-HXMT Det
Circular_text	TITLE: GCN CIRCULAR NUMBER: 21593 SUBJECT: GRB 170817B: Insight-HXMT observation DATE: 17/08/19 13:32:35 GMT FROM: Shaolin Xiong at IHEP Z. W. Li, J. Y. Liao, C. K. Li, X. B. Li, S. L. Xiong, C. Z. Liu, X. F. Li, Z. Chang, X. F. Lu, J. L. Zhao, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, X. Ma, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, H. Y. Wang, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: During the commissioning phase, at 2017-08-17T21:47:34.00 (T0), Insight-HXMT detected GRB 170817B (trigger ID: HEB170817908) in a routine search of the data, which was also observed by Fermi/GBM (Roberts et al. 2017, GCN 21540). The Insight-HXMT light curve consists of multiple pulses with a duration (T90) of 2.64 s measured from T0+0.40 s. The 50-ms peak rate, measured from T0+0.40 s, is 6135.4 cnts/sec. The total counts from this burst is 5353.1 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB170817908_lc.jpg All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. The time-averaged spectrum from T0 to T0+3.60 s is adequately fit by a Power Law model with spectral index = -1.60 +/- 0.05. The energy fluence is (1.09 +/- 0.05)E-05 erg/cm^2 in 200 - 5000 keV in this time interval. The analysis results presented above are preliminary; final results will be published elsewhere. Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org/index.php/enhome .